Sum of Orthogonal Vectors $V _ { 1 } \text { and } V _ { 2 } \text { is } ( 4 i - 8 j + 7 k )$

Multiple Choice

sum of orthogonal vectors $V _ { 1 } \text { and } V _ { 2 } \text { is } ( 4 i - 8 j + 7 k )$ . A unit vector along $V _ { 1 }$ is $( 0.635 i + 0.773 j )$ Vector $V _ { 1 }$ is:

A) $0.635 i + 0.773 j$
B) $- 1.635 i + 2.773 j$
C) $- 2.35 i - 2.82 j$
D) $2.57 i - 1.73 j$